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Vol. 148, No. 1, January 2013, pp. 47-51




A Portable Spectrophotometer for Water Quality Analysis

1 Xiaomin ZHANG, 2 Yanjun FANG, 1* Youquan ZHAO

1 College of Precision Instrument and Opto-electronics Engineering, Tianjin University,

Tianjin, P. R. China, 300072

2 Institute of Hygiene and Environmental Medicine, Academy of Military Medical Science, Tianjin, 300050

* E-mail: zhaoyouquan@tju.edu.cn


Received: 17 October 2012   /Accepted: 24 January 2013   /Published: 28 January 2013

Digital Sensors and Sensor Sysstems


Abstract: A portable water analyzer based on spectrophotometer has been designed and developed. The system embedded a module of 6 LEDs as long-life light source and a photodiode sensor transforms the light signal to electric signal, a microcontroller acts as the core of the analyzer to control the LEDs on/off, data acquisition, LCD and signal processing. For water quality analysis, a series of peak wavelength are selected including 420 nm, 455 nm, 515 nm, 560 nm, 605 nm and 630 nm, which can cover multiparameter like ammonia nitrogen, nitrite nitrogen, hexavalent chromium and arsenite up to 45 types. In order to test the performance, optical absorbance is measured back and fro, the results show it is with virtue of high repeatability and linearity. The system is suitable for rapid test in laboratory and in-situ river water samples test.


Keywords: Water quality, Spectrophotometer, LED, Absorbance, In-situ measurement



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